diff --git a/tools/check_cowork_screen.py b/tools/check_cowork_screen.py
index 5da12c4..f0bb55e 100644
--- a/tools/check_cowork_screen.py
+++ b/tools/check_cowork_screen.py
@@ -91,13 +91,13 @@ def main() -> int:
     # and its pane arrives folded to the strip the drawing keeps
     w = win.workspace
     sb = w._sidebar
-    print(f"vao Cowork: History gap={sb.is_collapsed()} rong={sb.width()}px")
-    if not sb.is_collapsed():
-        fails.append("pane Lich su mo san — man Cowork thanh 3 cot")
+    print(f"vao Cowork: History hien={sb.isVisible()}")
+    if sb.isVisible():
+        fails.append("pane Lich su van o tren man Cowork — ban ve chi co 2 cot")
     w.show_history_pane()
     app.processEvents()
-    print(f"sau 'Tat ca project…': History gap={sb.is_collapsed()} rong={sb.width()}px")
-    if sb.is_collapsed():
+    print(f"sau 'Tat ca project…': History hien={sb.isVisible()} rong={sb.width()}px")
+    if not sb.isVisible():
         fails.append("'Tat ca project…' khong mo duoc pane Lich su")
     w._on_history_fold(True)
     app.processEvents()
diff --git a/ui/workspace_tab.py b/ui/workspace_tab.py
index 6ea23c3..bf0b208 100644
--- a/ui/workspace_tab.py
+++ b/ui/workspace_tab.py
@@ -320,9 +320,13 @@ class WorkspaceTab(QWidget):
         sb.history_changed.connect(self._reload_threads)
 
     def _on_history_fold(self, collapsed: bool) -> None:
-        """Remember what the user chose, so switching screens does not undo it."""
+        """Its chevron closes the panel away, back to the drawn layout."""
         self._history_opened = not collapsed
-        self._set_sidebar_collapsed(collapsed)
+        if collapsed:
+            self._sidebar.setVisible(False)
+            self._apply_pane_visibility()
+        else:
+            self._set_sidebar_collapsed(False)
 
     def _set_sidebar_collapsed(self, collapsed: bool) -> None:
         """Collapse/expand History sidebar and redistribute splitter space so
@@ -411,15 +415,15 @@ class WorkspaceTab(QWidget):
         self._hint.setVisible(on_project and self.project_list.count() == 0)
         narrow = getattr(self, "_is_narrow", False)
         if self._sidebar is not None:
-            self._sidebar.setVisible(on_cowork)
-            # The drawing gives Cowork two columns — the transcript and the
-            # files panel — and moves history to the rail's RECENTS. Its own
-            # "Vấn đề" note is that three panes squeezed the conversation below
-            # 60% of the width. So History arrives folded to its strip: the
-            # chevron the drawing keeps, one click from the full panel, and
-            # "Tất cả project…" in RECENTS opens it outright.
-            if on_cowork and not self._history_opened:
-                self._sidebar.set_collapsed(True)
+            # Cowork is two columns in the drawing — transcript and files — with
+            # no history pane and no strip where one used to be. The relocation
+            # table is explicit: History moves to Sidebar ▸ RECENTS, "giữ, dễ
+            # tới hơn". So the panel is not on this screen at all until asked
+            # for: "Tất cả project…" in RECENTS brings it in, since search,
+            # filters, pin, rename and multi-select delete live only there.
+            self._sidebar.setVisible(on_cowork and self._history_opened)
+            if on_cowork and self._history_opened:
+                self._sidebar.set_collapsed(False)
         # QSplitter ignores hidden panes, but the freed width isn't handed to
         # the remaining panes deterministically — set explicit sizes after any
         # pane toggle (same lesson as _set_projects_collapsed).
@@ -714,8 +718,9 @@ class WorkspaceTab(QWidget):
         live in this panel.
         """
         self._history_opened = True
-        self._set_sidebar_collapsed(False)
         self._show_cowork_tab()
+        self._sidebar.setVisible(True)
+        self._set_sidebar_collapsed(False)
 
     def start_new_chat(self) -> None:
         """Start a new thread in the current project and show it.